Instrument for measuring and indicating the intensity of gas currents



May 3, 1949. w Y Y 2,468,896 1 INSTRUMENT FOR MEASURING'ANDrINDICATING THE INTENSITY 0F GAS CURRENTS F iled April 28, 1941 T OFFICE UNITED; STATES INSTRUMENT FOR MEASURING AND INDI- CATING THE INTENSITY OF GAS CUR- RENTS Wilhelm Rohn, Hanan on Main, Germany; vested in the Attorney General of the United States Application April 28, 1941, Serial No. 390,768 In Germany April 15, 1940 4 Claims. (Cl, 73-210) This invention relates to an instrument for of the instrument which intensity can be read measuring the intensitywof gas currents. For -:off from the scale. zllhiS purpose commonly revolving gas-meters or A pointer-or index Z is rigidly connected with the like devices are used, gand'on'ly some expenthe shaft F and cooperates with the indicator :sive typesofrinstruments are available from which 5 chart E. The arm L extends fromitheplever'fG ;the volume: of a gas flowing through a gaspipe with its axis passing through the shaft'an'dzcar- .per unit-of time can be read off. Generally it is ries, according to the invention, .as- :an' adiustnecessary to subsequently. reduce the indications able counter-Weight and, at the .same rtime; :as of such instruments to normal conditions of a temperature compensator a bimetallic strip temperature and atmospheric pressure by reck- 0 N Wh ch may he te y Screws .0I13he51l19 oning-l Q disposed .at different points-of thestripN'. For

The 1object..of. .my invention is to provide an instance, p ns- 01 SereWS f t ht instrument .of. this type. which .is simple fiand be put into holes distributed over the strip: N. cheap. .and.from. which. the indication can be The-bimetallic strip N is composedof twocnreread oif reduced to normal conditions of temper- I5 tallic .materials'having different-moduli :of'-therature and atmospheric pressure. mal expansion; it has such dimensions thattit The instrument forming the object of my inb s more 01 s on at Hereby the vention is illustrated in the accompanying draweights Q a d on the Strip are more 185$ ing showing, by way of example, in Fig. 1 a side ppr h d to t shaft and n q y the view of the instrument, and in Fig. 2 a fractional d ective force exerted on the lever G is decross-section on the line II-II of Fig. 1. creased or increased according as the weights are A is a box-like casing provided at B and C with moved toward a y f o e S aft h s sockets for inserting the instrument into a pipemeans that the lever G with the horn-like memline in which the gas current flows, the intensity r J is defl d to a l r or r ter xtent of which is to be measured and indicated. A y the s issuing o t e mbe D then sector-like fore-chamber D is arranged in the Would be the case with the weights Q f h casing communicating with the inlet socket B. Strip N in the position shown in W t The front and the rear side of the casing may the gas exp d because of elevated p abe covered with glass plates T1, T2, one of which tllre a relatively a er Volume of gas is indimay carry the indicating cha t, E. cated. to enable a reading corresponding to nor- In the middle of the casing th shaft F 1 mal conditions. If desired the scale may be caliranged, preferably journaled in two jewel bearbretedin kilograms p r hourings. It carries a lever G to one end of which is y suitably ch the t p 0 t e ornsecured the gas current damming body h r like member J and the Weight of the countershown as an arcuate horn-like member J proe ght N, Q. e s ng range of the injecting through a hole K bored in n n of strument can be chosen at will. As a rule the the sector-like casing D and l ing, i th zero shaftF of the instrument will be placed in a horiposition of the instrument, with its greater part 201113811 p sition, but by tu n g t e measuring in an arcuate horn-lik he th P tightly d strument about the axis of the sockets B and C, firmly inserted into a hole 0 in the opposite wall so as t bring th s aft F nt a ed p of the casing D. tion, the measuring system may be more or less When the gas to be measured enters t approached to its labile position. Hereby it is tor at B in th directio of t arrow a it possible to vary the sensibility of the instrument within wide limits. By arranging the inlet sock- 40 et B and the outlet socket C on a horizontal line and providing them with stuffing boxes one in the direction of the arrow b. In passing it presses the horn J out of the hole K and turns and the m Instrument may be used for dlffer' ent measurmg ranges.

the shaft with the lever G in clockwise direction.

As the horn-like member J tapers toward its free SZ EZ; g ilfi ggj gfg aggfig g gi, 2: end, the annular gap between the horn J and the body AS herein Shown the tube R extends periphery of the hole K increases in width in acfrom t lever G on t o pposite id from th cordance with the deflection of the lever G, and m L and its longitudinal axis passes through one stable position exists for each intensity of the the shaft F. This tube serves for pressure com gas current within the range of angular deflection pensation. Its action depends upon its property tempts to pass over into the other part of the casing through the hole K and to leave it at C of being compressed by increasing pressure. Thereby the center of gravity of the weight S is displaced toward the shaft F and exerts a smaller directive force on the lever G whereby the deflection of the lever G including the hornlike member J secured thereto is increased. The corrugated tube R and the weight S may have such dimensions that the increased deflection of the lever G under the action of the pressure just compensates for the decrease of the gas volume to be indicated.

By arranging the corrugated tube below the axis of rotation the overweight producing the directive force on increase of the pressure may be diminished.

I claim:

1. An instrument for measuring and indicating the intensity of a gas current and reducing the measurement to indications of rate of flow at normal conditions of temperature and pressure, comprising a casing having a wall having an orifice through which the fluid to be metered flows, a shaft rotatably mounted in said casing, a lever carried by the shaft, a damming body carried by the lever and cooperating with said orifice to be responsive to the rate of flow, a weighted bimetallic strip connected with said lever to compensate for temperature changes, and a weighted corrugated tube, closed at both ends and connected with said lever to compensate for pressure changes, and indicating means including a movable member carried by the shaft.

2. A measuring and indicating instrument as recited in claim 1, wherein said strip and said weighted tube are disposed on opposite sides of said lever.

WILHIEH'JM ROHN.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 999,950 Berthelot et a1 Aug. 8, 1911 1,401,299 Wohlenberg Dec. 27, 1921 1,538,164 Buell May 19, 1925 1,788,976 Beraud et a1. Jan. 13, 1931 1,972,736 Haug Sept. 4, 1934 2,103,262 Knerr Dec. 28, 1937 FOREIGN PATENTS Number Country Date 613,282 France Aug. 20, 1926 745,170 France Feb. 7, 1933 748,247 France Apr. 10, 1933 

